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containing coal under the same moisture conditions is compared and analyzed. 2.2. Coal Sample Preparation. Coal and gas outburst phenomena often occur during the process of coal mining via the method of "stone gate coal uncovering" and in geological structural zones, and there is a more obvious outburst risk in soft
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Mining. In Australia, nearly 80% of coal is produced from open-cut mines, in contrast to the rest of the world where open-cut mining only accounts for 40% of coal production. Open-cut mining is possible because coal seams are close to the surface. Such mining is cheaper than underground mining and enables up to 90% recovery of …
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Soil moisture is a critical parameter for land reclamation and ecological restoration in mining subsidence areas. However, limited research has been conducted into the impact of subsidence on soil moisture in semi-arid areas. In this study, the subsidence and soil moisture of four coal seams (4101 and 4102 coal seams are 2-year and 1 …
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There are four major types (or "ranks") of coal. Rank refers to steps in a slow, natural process called "coalification," during which buried plant matter changes into an ever denser, drier, more carbon-rich, and harder material. The four ranks are: Anthracite: The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, …
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Long-term dewatering of groundwater is a necessary operation for mining safety in open-pit coal mines, as extensive dewatering might cause ecological problems due to dramatic changes in moisture movement in the soil, especially in ecologically fragile areas. In order to evaluate the impact of the coal mining operation on moisture …
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Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity.It is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion (burning). Coal is the largest source of energy for generating electricity in the world, and the most abundant fossil fuel …
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These "Beehive" coke ovens were constructed in the late 1890's to carbonize or "Coke" coal mined in coal basin for the Colorado Fuel and Iron company. A narrow-gauge railroad, approximately 12 miles long …
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Stone dust application prevents coal dust explosions in underground coal mines. We look at the industry best practice for this. ... Coal mining operates under a risk-based legislative framework considered under sections of the Queensland Coal Mining Safety and Health Regulation. These are sections 300, 301, 302 and 303 which provide …
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Abstract. Moisture is one of the most important factors that influences coal seepage and coal-bed methane (CBM) extraction. To obtain the water occurrence state and dynamic processes of water change in coal, a series of microscopic observation experiments of …
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This study revealed the principles of spatial variability of soil moisture in coal mining subsidence areas in Northwest China, which can provide a scientific basis for the restoration of mining areas.
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Stone dusters are required for all Australian underground mines. They spray stone dust to encapsulate coal dust, preventing explosions. CR's Razer stone dusting systems have been relied on for years by top tier miners. Our stone dusters just work, with minimal moving parts or breakdown issues, even in the harshest underground environments.
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Request PDF | Experimental study on the effect of inherent moisture on hard coal adsorption–desorption characteristics | Coal is a complex geological body that is composed of organic material ...
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In order to explore effects of coal mining subsidence on water resources in soil,distribution characteristics of soil moisture in mining subsidence area were studied and the relationship between mining crack width,fracture density and soil water content was discussed. The study showed that mining subsidence cracks had resulted in a decline …
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Excessive coal moisture leads to a lower heating value and power plant efficiency, and increased transportation costs. Therefore, coal stockpile management and moisture control are particularly important in …
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Data in Fig. 3.2, show that because the ash content of coal is affected greatly by the geological evolution conditions, the data points are much more dispersed than the moisture trend shown in Fig. 3.1.Generally, the ash content of coal shows a decreasing trend with the increased metamorphism where the maximum value does not …
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reliable and sensitive to soil moisture in the whole coal mining zone of Northern Shaanxi based upon the soil sample parameters collected from in situ site investigation, spectral data gathered simultaneously and the images of Landsat7 ETM. The model uses different phases of Landsat data to retrieve soil moisture and analyze the patterns of ...
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DOI: 10.1016/0148-9062(76)91996-3 Corpus ID: 108129419; The mechanisms of strength reduction due to moisture in coal mine shales @article{Vaneeckhout1976TheMO, title={The mechanisms of strength reduction due to moisture in coal mine shales}, author={E Vaneeckhout}, journal={International Journal of Rock Mechanics and Mining …
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The coal development zone of Northern Shaanxi, China is one of the eight largest coal mines in the world, also the national energy and chemical bases. However, the coal mining leads to ground surface deformation and previous studies show that in collapse fissure zone soil water losses almost 50% compared with non-fissure zone. The main objective of this …
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moisture range of long-flame coal is 3–12%, whereas the moisture in anthracite is lower (Tang et al. 2015; Wang et al. 2014a; Yu and Cheng 2012). The presence of different inherent moistures will occupy the gas adsorption sites of coal and the channel of gas migration and diffusion, which determines the coal gas content and outburst risk (Beam-
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Coal rank is defined by several parameters throughout the rank range, from heating value and moisture in lower rank coal (lignite and subbituminous), to volatile matter/fixed carbon and total carbon (proximate and ultimate analyses) in high and medium volatile bituminous rank coal through, at least, semi-anthracite, and hydrogen and X-ray ...
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The study results can serve as the baseline for monitoring environmental impacts on soil moisture in the regions due to coal mining. Discover the world's research. 25+ million members;
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This study revealed the principals of spatial variability of soil moisture in coal mining subsidence areas in Northwest China, which can provide a scientific basis for the restoration of mining areas.
WhatsApp: +86 18221755073
Notably, SE treatment induced partial condensation within the aromatic layers of coal's organic phase, increasing the stacking height of microcrystals, aromaticity, and …
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As the depth of coal seam mining increases, coal and gas outburst prevention and control face unprecedented challenges. In recent years, freezing …
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The current study investigated the impact of coal mining on deep soil moisture from the perspective of the absolute value of soil moisture. A combined …
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value (CV), ash, moisture, sulphur (). Fig.1 ... Open-pit coal mining is widespread in Ethiopia where there are more than 430 million tons of coal deposits found in the country of ...
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Pyrite has a significant effect on the spontaneous combustion of coal. The presence of pyrite can change the propensity of coal towards spontaneous combustion. The influences of various pyrite contents on the parameters of spontaneous combustion, such as index gases, temperature and released heat etc., were investigated in this study. Coal …
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Soil porosity and moisture are critical indicators of soil quality. In coal–grain intercropping areas, centuries of coal industry activities have resulted in coal particle contamination, …
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Moisture content of coal can affect the mechanical properties (Yao et al. 2019) and absorption capacities (Perera et al. 2011) of coal matrix, which can directly …
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The RS technology is used to monitor the soil water content in the coal mining area with a high submersible water level, and to find a more convenient, rapid and reasonable method for monitoring ...
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